What is a light-year? question 13 options: the distance light travels in one earth year the distance light travels from the sun to the earth the distance light travels in one orbit of the moon the time it takes light to travel across the universe

The distance light can travel in one year. hope this .

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass

Your answer is going to be a. i know my biology